Summary: The Republican primary in Indiana is a must-win for Ted Cruz if he is to have any prospect of preventing Donald Trump from reaching the 1,237 delegates required to secure the Republican nomination for president on the first ballot at the Republican National Convention. Who will win the Indiana primary election? The Personal Electability Index (PEI), developed by Aubrey Immelman at the Unit for the Study of Personality in Politics (USPP), projects that Donald Trump will beat Ted Cruz in the Indiana Republican primary. … Update: Sen. Ted Cruz had harsh words for rival Donald Trump on the day of the Indiana primary, calling him “a pathological liar … straight out of a psychology textbook,” “utterly amoral,” “a narcissist at a level I don’t think this country’s ever seen,” “an arrogant buffoon,” and “a serial philanderer … [who] describes his own battles with venereal diseases as his own personal Vietnam.”